Photographic-printing machine



I. ABEL.

PHOTOGRAPHIC PRINTING MACHINE.

APPLICATION FILED IuLv I2, 1919.

1,375,662, Patented Apr. 26, 1921.

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PHOTOGRAPHIC PRINTING MACHINE. APPLICATloNl FILED JULY 12, 1919.

l,375,662. Patented Apr. 26,1921.

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JOSEPH ABEL, OF WASHINGTON, DISTRICT OF COLUMBIA.

PEOTOGRAPHIC-PRINTING MACHINE.

Application led July 12,l

To all whom it mary concern:

Be it known that I, JOSEPH ABEL, a citizen of the United States, residing at Washington, in the District of Columbia, have invented certain -new and useful Improvements in Photographic-Printing Machines, of which the following is a specification.

This invention relates to photographic printing machines; and it comprises a device or attachment for printing machines adapted to be used in making prints from films of various sizes or parts thereof `or from glass negatives.

An object of the present invention is to provide a mask for making photographic prints from films and glass negatives of various sizes which is simple in construction and which may be readily attached to any suitable printing machine without altering the construction of the machine.

Another object is to provide a mask which may be hinged to the top of a machine so that it may be readily lifted out of the way for cleaning the glass, making repairs to the lamps, or lamp boX, etc.

A further object is to provide a device which is readily adjustable for work on prints of different sizes.

Still another object. is to provide a print having means for positionin the edge of the paper to permit the use o .paper cut to the proper size to provide a border of uniform width on all sides of the print.

Another object of the present invention is to provide a printing mask that, when applied to the machine, will hold the film in position by its weight. l

In the accompanying drawings I have I shown an advantageous embodiment of this invention. In this showing- Figure 1 is a side elevation of a printingmachine showing the lamp box, the lamp being indicated in dotted lines;

F ig. 2 is a plan view of the mask;

Fi 3 is a transverse sectional View of the line 3-3 of Fig. 2 looking in the direction of the arrow; and t Fig. 4 is a longitudinal sectional view of the line 4--4 of Fig. 2 showing the means for adjusting the plates on the side bars.

In the accompanying drawings the letter A designates a printing machine of the usual construction provided with a top l and lamp box 2. T e lamp box 1s provided with a small ruby lamp 3 and a large lampY 4. The lamps are connected by a two-way VSpecitcation of Letters Patent.

Patented Apr. 26, 1921.

1919. Serial No. 310,474.

switch (not shown) whereby one of the lamps 1s extlnguished when the other is lighted. A window (not shown) is arranged o n the surface of the machine whereby the light from the lamp box may be projected onto a film and printing paper arranged above the surface. A cover 5 is arranged over the window of the machine and is hmged thereto as at 6. An operating rod 7 hinged to the machine at 8 is connected to the cover by a chain 9. Spring 10 is provided for normally holding the cover in raised position. NW hen a print is to be made the operating rod is forced down and the cover is held against the window by the action of leaf springs 11 carried by the operating rod and contacting with the outer side of the cover. A projecting pin 12 is carried by the operating rod and is adapted to actuate switch 13 when the rod is lowered to extinguish the small ruby lamp and to light the large printing lamp.

The mask s arranged upon the machine beneath the cover and is adjustable for the purpose of making prints of different sizes.

- The construction of the mask is shown in detail in Figs. 2, 3 and 4 of the drawings. As shown, it consists of a pair of side bars 14 and 15 and a connecting bar 16. It is best provided with another connecting bar 17 which gives added strength and ri idity. However, under some conditions may dispense with this member. The bars are connected'to each other to form a rectangle by plates 18 arranged beneath the -bars and connected thereto by screws 19.

Any type of fastening means may be employed, but I find it advantageous to empio the fastening means described to permlt ready disassembling of the mask. If the parts of the mask are not in proper adjust ment, it is practically useless and I therefore provide this type of fastening means to permit the parts to be separated and properly assembled. This frame is connected to the to of hinges 20. s shown, one leaf of each of the hinges is secured to the top by screws 21` which permit the entire mask to be readily removed from the machine. A plate 22 slidably mounted upon the side bars to permit adjustment and a second plate 23 of the machine by means cured to the side bars by a. sleeve 26 formed of a piece of metal and bent to provide a space for the receptionpf the side bars. The lengt-li of the sleeves is e u al to the width of the plates giving stabi ity andr1g1d1ty to the structure and tending to keep the plates parallel and at right angles to each other. A leaf spring 27 is secured to this sleeve and is provided with a downwardly projectin, ,1r pin 28 which isadapted to be received in openings 29 provlded in the side bars.' These openings may be spaced to pr0' vide adjustments for standard sized prints, and the size of the negative may be indicated on the top of the machine as at 29. This spring is best provided with a-n upturned end 30 whereby it may be readily grasped by the fingers of the operator.

A second plate 31 is slidably mounted uponthe bars 14 and 15 and arra-nged parallel to the plate (22). The means for mounting the plate 31 upon the side bars and for a-djustably holding it in various positions are the same as the means employed in mounting the plate 22 (just described) and further description therefore is unnecessary. As shown, the plate 31 is arranged beneath the plate 23. Another plate 32 is slidably mounted upon the bar 16 and arranged parallel to the plate 23. This plate is also adjustable by means of the spring catch 33 adapted to be received in openings 34 arranged in the bar. Openings 34 are also spaced to provide stands ard adjustments and the 'sizes indicated as In operation )the plates are adjusted to provide a rect/angle of the same size as the negative from which a print is to be made. The film is placed in the machine 4 and the mask is arranged ontop of the film holding it in place. A sheet ofpaper of the proper size is arranged on top of the mask with two edges of the paper bearing against ledges 24 and 25. The cover of the machine is then lowered and the paper exposed for the proper length of time to make the print. The provision of the ledges 24 and 25 makes itpossible touse paper cut to the proper size to provide a. border of uniform width on all four sides of the paper. Heretofore it has been customary to take a sheet of paper several sizes too Vlarge for the print to be made and trim off the edges to provide a uniform border. The openings 29 in the side bars and the openings 34 in the cross bar are spaced from each other at the proper intervals to provide openings in the mask for films of standard sizes. In making prints it is therefore only necessary to know the size of the film and to adjust the machine accordingly instead of making minute adjustments to get the proper size opening in the mask. The adjustments are positive and, when once made, can be used for any number of negatives, the plates 31 and 32 may be left inv position and plate 22 adjusted. The holes in the upper part of rods 14 and 15 are ar ranged at odd distances from each other to permit such odd adjustments.`

What I claim is 1. A photographic printing machine comprising a lamp box, a Window on top of the box, a mask hinged over the a cover hinged over the mask:

2. A mask for photographic printing machines comprising y, rods detachably secured to each other, a rightangled plate slidably mounted thereon and a pair of other plates each one of which is parallel to one arm of said right-angled plate and slidably mounted on rods Fof the said mask in position to form with said right-angled plate a contai-ned rectangle of any desired size.

3. A mask for k.photographic printing machine comprisingfrods Secuied together, a right-angled plate slidably mounted on one or more of said rods, a pair of other plates Window and said right-angled plate and slidably mounted on said rods, said plates being provided with sleeves surrounding a rod, the rods being provided with openings and spring catches having pins adapted to be received in said openi gs.

4. A photographic printing machine comprising a lamp box, a support on top thereof for the film, a hinged mask over said support, and a cover over said mask, whereby the object to be printed from may be po sitioned on the support under the mask, the mask lowered into place, the paper to be printed upon placed in position on the mask, and the cover lowered over the mask.

5. A photographic printing mask comprising rods secured together in the form of a `frame, a right-angled plate having one arm thereof mounted to slide on opposite rods of the frame, and two other plates each mounted to slide on the rods of the frame, one such plate being mounted on the same rods as said right-angled plate and the other said plate being mounted on one of the other rods.

6. A mask for photographic printing machines comprising rods secured together in the form of a rectangular frame, two parallel plates extending across the frame and ,mounted to slide on opposite rods toward JOSEPH ABEL. 

